// Copyright (c) 2006-2008 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

// See net/disk_cache/disk_cache.h for the public interface of the cache.

#ifndef NET_DISK_CACHE_BLOCKFILE_FILE_BLOCK_H_
#define NET_DISK_CACHE_BLOCKFILE_FILE_BLOCK_H_

#include <stddef.h>

namespace disk_cache {

// This interface exposes common functionality for a single block of data
// stored on a file-block, regardless of the real type or size of the block.
// Used to simplify loading / storing the block from disk.
class FileBlock {
public:
    virtual ~FileBlock() { }

    // Returns a pointer to the actual data.
    virtual void* buffer() const = 0;

    // Returns the size of the block;
    virtual size_t size() const = 0;

    // Returns the file offset of this block.
    virtual int offset() const = 0;
};

} // namespace disk_cache

#endif // NET_DISK_CACHE_BLOCKFILE_FILE_BLOCK_H_
